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Equity-Indexed Compensation Plans (Details 3) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Other Consolidated Equity-Indexed Compensation Plan Information        
Equity-indexed compensation benefit $ (8)      
Equity-indexed compensation expense   $ 22 $ 27 $ 90
LTIP unit-settled vestings 2 1 37 52
LTIP cash-settled vestings 10   66 52
DER cash payments $ 2 $ 2 $ 6 $ 6